Tactics Trainer Questions

How many positions are there and how high do the ratings of the positions go?

How often are positions added to the database?

Is there any way to get the tactics trainer to repeat missed positions in the future database until they are solved correctly?

Take a look at http://www.chess.com/tactics/problems.html?sortby=rating_hard for the answer to your first two questions.

We try to add new Tactics to the database once every couple of months but this can vary.

And for your last inquiry there is not an exact feature for this but you can go to your Tactics Trainer settings page at http://www.chess.com/tactics/settings.html and then choose the "Stop only if I fail a problem". Also, on your Tactics Trainer homepage you will see "Recent Problems" under which you can click one of them to try the problem again.

What is the highest rating ever recorded?

Another question:  Why is it possible to lose points when correctly solving a problem?

At the bottom of the screen, there is a clock.  If you don't beat the clock, you will lose points even if you get the problem correct.  T

The point of the timer is apparently that a person of a certain tactical rating should solve a particular problem within a certain amount of time, depending on how others have scored on that problem, and if they take longer then they lose points. This doesn't make sense because it's very possible that many of the people who got correct answers in a very short time did not adequately consider all of the possibilities. In other words it should have taken longer to solve. This then penalizes the ones who are getting the problem within a reasonable time but seemed to take too long.